“Generalization of Back-Propagation to Recurrent Neural Networks”, 1987-11-09 (; backlinks):
[independent of 1988] An adaptive neural network with asymmetric connections is introduced. This network is related to the Hopfield network with graded neurons and uses a recurrent generalization of the δ rule of Rumelhart, Hinton, and Williams to modify adaptively the synaptic weights.
The new network bears a resemblance to the master/slave network of 1986 but it is architecturally simpler.